Malicious PDF — malware analysis report

Static analysis result for SHA-256 81024cf4a0245dd2…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 13:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d32c8dcbc7c28167d00c18c091c8819b SHA-1: 1f035cdba4a58a6a37a80c92518fc741899d5349 SHA-256: 81024cf4a0245dd20ba070b5e5f3c99885917f9073c688f8f218503d5d52b781
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or employs social engineering. The presence of embedded JavaScript and links to compromised WordPress sites suggests an attempt to download and execute a second-stage payload. The URLs point to potentially malicious content hosted on various domains, disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612783227f3fc---lajivunonizufelanogefamux.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0fa7fc574dab0d8751ff3973d29b551e/lamujuzewifafe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vepaxezajudogage.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/89871889635.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9766b617b9---89157208376.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20da3d172---31773429763.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/h1lhukhuusjl5v3k9i0mgae7o7/leperugaxo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcab36dcd---kokepufisofutisunuv.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/26311548858.pdfIn PDF document text
    • https://edarky.net/data/file/8298867213.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/zaduf.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609715746fefb---jebinuweluromagu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4ab2ccd4522971da216f45242002db26/giruvuxefoboxanotere.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/94621871700.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jr3fqpnlg1kdqt2epoi2re9ekh/6461063939.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/98434663321.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/gusegamisiwozonaza.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b40eea84---85586162755.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/temofigaxeseparubaro.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/35692385198.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/hmnjpajboagcfro00kk0bv3d73/16877106783.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/n775pedv7medtjgoci40m457n9/vipusibadakaz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085274037276---32828093139.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/51289784228.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jemedisodat.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuluvafunipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=organisational+culture+journal+articles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 21656 bytes
SHA-256: 6c4218e12c7eaaf95309604bd504729686a8ac0d456ad8888cc3fa3cb39ac905
font_02_sfnt_off00014851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14851 11048 bytes
SHA-256: b84ae4d2072ac185a6a0f2f281491b066fad1cb0087354a6b3c3c08356007083

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